For each of the following situations, indicate the accounting concept that is violated. While some of these statements may appear to violate more than one accounting concept, each answer should be used only once. [Choose Wagner Corporation adjusted the valuation of all assets and liabilities to reflect changes in the purchasing power of the dollar. [Choose Spooner Oil Company changed its method of accounting for oil and gas exploration costs from successful efforts to full cost. No mention of the change was included in the financial statements. The change had a material effect on Spooner's financial statements. Choose Cypress Manufacturing Company purchased machinery having a five-year life. The cost of the machinery was expensed in full at time of purchase. Choose Rudeen Corporation purchased equipment for $180,000 at a liquidation sale of a competitor. Because Rudeen believed the equipment to be worth $230.000, it reported the equipment in its subsequent balance sheet at $230,000 Choose Davis Bicycle Company received a large order for the sale of 1,000 bicycles at $100 each. The customer paid Davis the entire amount of $100.000 on March 15, and Davis recorded the revenue on that date. Davis did not deliver the bicycles to the customer until April 17